[dangerface]

RGB is used for describing the colour of light if you are a web developer like me you will never need anything else. CMYK is used for printed colours that reflect light and as such there isn't a direct correlation between them.

For example RGB blue #0000ff is so bright it can not be printed, if you tried it would look a lot darker blue than the screen shows. This issue with printed colours looking different from screen space colours is that printed colours will also look different depending on the surface they are printed onto and a variety of other variable.

Your work around is fine for me as I work in RGB and would really only need the Pantone when im printing once every 5 years? If you are a print designer then you will be using the colours all day every day and having to switch or a reference that isn't exact results in expensive printing mistakes.